Google Now, the mind-reading personal assistant for iOS and Android, has gotten a ton of updates…
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For obvious reasons, your mileage may vary with this particular feature. Theoretically Google Now should be able to track your GPS location or set an alarm based on the estimated time you will arrive, but some subways have no service and sometimes trains are late. Nothing beats being aware of your surroundings. But if you want a little extra nudge, Google Now can give you a ring when you're close.